Hardware n Choose k Counters with Applications to the Partial Exhaustive Search. - Koji Nakano; Youhei Yamagishi (IEICE Trans. Inf. Syst., 2005)

Efficient hardware algorithms for n choose k counters. - Yasuaki Ito; Koji Nakano; Youhei Yamagishi (IPDPS, 2006)

Efficient Hardware Algorithms for n Choose k Counters Using the Bitonic Merger. - Yasuaki Ito; Koji Nakano; Youhei Yamagishi (Int. J. Found. Comput. Sci., 2007)